precision and recall

Recall Precision M. Sc. Johannes Schildgen 2016-06-09 [email protected] and

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Recall

Precision

M. Sc. Johannes Schildgen2016-06-09

[email protected]

and

Hariboogle

HariboogleColor-Rado

Hariboogle

Color-Rado

42 Results in 0,002 Seconds ?

Shouldbe

found

Was found

Relevant Found

Relevant Found

Relevant Found

5 1414246

Relevant Found

5 141

Precision: |𝑹∩𝑭|

|𝑭|

4246

=𝟒𝟏

𝟒𝟐= 0,98 = 98%

„How many % of the found items are relevant?“

Hariboogle

Precision: |𝑹∩𝑭|

|𝑭|= 1 Perfect!

HariboogleColor-Rado

Suche

Precision: |𝑹∩𝑭|

|𝑭|= 1 Perfect!

Hariboogle

Suche

Precision: |𝑹∩𝑭|

|𝑭|= 1 Perfect!

No rubbish

Only a few results

1 result

Improve Precision

• Find less rubbish (=> Relevance Feedback)

Precision: |𝑹∩𝑭|

|𝑭|

Hariboogle

Color-Rado

42 Results in 0,002 Seconds

Improve Precision

• Find less rubbish (=> Relevance Feedback)

Precision: |𝑹∩𝑭|

|𝑭|

Hariboogle

Color-Rado

42 Results in 0,002 Seconds

Relevant Found

5 141

Recall: |𝑹∩𝑭|

|𝑹|

4246

=𝟒𝟏

𝟒𝟔= 0,89 = 89%

„How much % of the relevant items were found?“

Hariboogle

Recall: |𝑹∩𝑭|

|𝑹|= 1 Perfect!

HariboogleColor-Rado

Recall: |𝑹∩𝑭|

|𝑹|= 1 Perfect!

Hariboogle

?? ?

Recall: |𝑹∩𝑭|

|𝑹|= 1 Perfect!

All relevant items were found

A lot of rubbish

803214523509235*1012 Billion results

Improve Recall

• Find more relevant items (easier said than done)

Recall: |𝑹∩𝑭|

|𝑹|

Conclusion

Precision: |𝑹∩𝑭|

|𝑭|

Relevante Gefundene

Conclusion

Precision: |𝑹∩𝑭|

|𝑭|

Recall: |𝑹∩𝑭|

|𝑹|

Relevante Gefundene

An exact analytical relation among recall, precision, and

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